2BHI

Crystal structure of Taiwan cobra cardiotoxin A3 complexed with sulfogalactoceramide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.31 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Glycosphingolipid-Facilitated Membrane Insertion and Internalization of Cobra Cardiotoxin: The Sulfatide/Cardiotoxin Complex Structure in a Membrane-Like Environment Suggests a Lipid-Dependent Cell-Penetrating Mechanism for Membrane Binding Polypeptides.

Wang, C.-H.Liu, J.-H.Lee, S.-C.Hsiao, C.-D.Wu, W.-G.

(2006) J.Biol.Chem. 281: 656

  • DOI: 10.1074/jbc.M507880200

  • PubMed Abstract: 
  • Cobra cardiotoxins, a family of basic polypeptides having lipid- and heparin-binding capacities similar to the cell-penetrating peptides, induce severe tissue necrosis and systolic heart arrest in snakebite victims. Whereas cardiotoxins are specifica ...

    Cobra cardiotoxins, a family of basic polypeptides having lipid- and heparin-binding capacities similar to the cell-penetrating peptides, induce severe tissue necrosis and systolic heart arrest in snakebite victims. Whereas cardiotoxins are specifically retained on the cell surface via heparan sulfate-mediated processes, their lipid binding ability appears to be responsible, at least in part, for cardiotoxin-induced membrane leakage and cell death. Although the exact role of lipids involved in toxin-mediated cytotoxicity remains largely unknown, monoclonal anti-sulfatide antibody O4 has recently been shown to inhibit the action of CTX A3, the major cardiotoxin from Taiwan cobra venom, on cardiomyocytes by preventing cardiotoxin-induced membrane leakage and CTX A3 internalization into mitochondria. Here, we show that anti-sulfatide acts by blocking the binding of CTX A3 to the sulfatides in the plasma membrane to prevent sulfatide-dependent CTX A3 membrane pore formation and internalization. We also describe the crystal structure of a CTX A3-sulfatide complex in a membrane-like environment at 2.3 angstroms resolution. The unexpected orientation of the sulfatide fatty chains in the structure allows prediction of the mode of toxin insertion into the plasma membrane. CTX A3 recognizes both the headgroup and the ceramide interfacial region of sulfatide to induce a lipid conformational change that may play a key role in CTX A3 oligomerization and cellular internalization. This proposed lipid-mediated toxin translocation mechanism may also shed light on the cellular uptake mechanism of the amphiphilic cell-penetrating peptides known to involve multiple internalization pathways.


    Organizational Affiliation

    Department of Life Sciences and Institute of Bioinformatics and Structural Biology, National Tsinghua University, Hsinchu, Taiwan 30013, Republic of China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CYTOTOXIN 3
A, B
60Naja atraMutation(s): 0 
Find proteins for P60301 (Naja atra)
Go to UniProtKB:  P60301
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SFT
Query on SFT

Download SDF File 
Download CCD File 
A
SULFOGALACTOCERAMIDE
SULFATIDE
C48 H93 N O12 S
QTTLKKFUOJQIRB-JOLIRYOJSA-N
 Ligand Interaction
C10
Query on C10

Download SDF File 
Download CCD File 
A, B
HEXAETHYLENE GLYCOL MONODECYL ETHER
C22 H46 O7
GLGQRQQFWLTGES-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.31 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.219 
  • Space Group: P 63 2 2
Unit Cell:
Length (Å)Angle (°)
a = 63.327α = 90.00
b = 63.327β = 90.00
c = 120.879γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data scaling
CNSrefinement
HKL-2000data reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-11-28
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance